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R. W. Cohn, M. Duelli, “Ternary pseudorandom encoding of Fourier transform holograms,” J. Opt. Soc. Am. A. 16, 71–84 (1999).
Delineation of nonlinear effects on encoding: (a) simulated and (b) experimental diffraction pattern intensity for nonrandom ternary encoding, (c) experimental diffraction pattern for pseudorandom ternary encoding. These patterns show a larger view of the diffraction pattern than those in Figs. 6 and 7. Each intensity cross section is along the diagonal of the corresponding gray-scale image. In (a) and (b) the nonrandom ternary encoding produces mixing products, as evident in the lower left corner of each gray-scale image. Although speckle noise is evident in this same region for pseudorandom ternary encoding [(c)], it is much lower in intensity than the mixing products for (b). The saturated spot (centered on the optical axis) in (b) and (c) is primarily a result of the SLM cover glass not being antireflection coated. The most severe effect of the SLM’s limited resolution is the appearance, to the lower left of the optical axis, of a duplicate 7 × 7 spot array in (b) and (c).